I make a Microsoft Word document in a table format of the days were there (like a calendar). Then on each day, I use different color fonts to represent parks, times, PS restaurants, etc...
On the back of the page, I keep a list of hotel numbers, train numbers, car service, rental car info, etc... Then I laminate the page.
The first year I had a whole folder of notes and it just didn't work for me. I try to keep a lot of tips in my head or jot it down on the day planned on my itinerary. I leave the itinerary in the room, but refer to it the whole trip.
Another good idea is to bring a highlighter pen with you (learned this one from the cruise!) to highlight the park map with attractions you MUST see and parade times. I found this to be great since you always have your park map with you and I refer to it like a bible!